Do you really want to send Webster 1913 a message saying you like their work?
Plac`o*der"mi (?), n. pl. [NL., fr. Gr. , , a tablet + skin.] Paleon.
An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus.
© Webster 1913.